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Classification and description of world formation types

United States. Federal Geographic Data Committee. Vegetation Subcommittee. Hierarchy Revisions Working Group, author.
Fort Collins, CO : United States Department of Agriculture, Forest Service, Rocky Mountain Research Station, August 2016. 2016-

Definitions and codes for seral status and structure of vegetation

Portland, OR (333 S.W. First Ave., Portland 97208) : U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Research Station, [1995] 1995